Iyo winjiye mu iduka ryibirahure hanyuma ukagerageza kugura ibirahuri, uba ufite ubwoko butandukanye bwamahitamo ukurikije ibyo wanditse. Ariko abantu benshi bayobewe nijambo icyerekezo kimwe, bifocal kandi bitera imbere. Aya magambo yerekana uburyo lens mu kirahure cyawe cyateguwe. Ariko niba utazi neza ubwoko bwibirahuri ibyo wanditse bisaba, dore incamake yihuse igufasha gutangira.
1.Icyerekezo kimwe cyerekezo ni iki?
Icyerekezo kimwe cyerekezo ni lens ifite inyandiko imwe. Ubu bwoko bwa lens bukoreshwa muburyo bwandikirwa abantu bareba kure, bareba kure, bafite astigmatism, cyangwa bafite ihuriro ryamakosa. Mubihe byinshi, ibirahuri byerekanwa rimwe bikoreshwa nabantu bakeneye imbaraga zingana kugirango babone kure kandi hafi. Ariko, hariho ibirahuri byerekanwa byateganijwe kubwintego runaka. Kurugero, ikirahuri cyo gusoma ibirahuri bikoreshwa mugusoma gusa birimo lens imwe yo kureba.
Intumbero imwe yo kureba ni nziza kubana benshi ndetse nabakuze bato kuko mubisanzwe badakeneye guhindura icyerekezo cyabo bakurikije intera yabo. Icyerekezo kimwe cyibirahure byandikirwa buri gihe birimo ibintu bifatika nkumubare wambere kubyo wanditse kandi birashobora no gushiramo silinderi kugirango ikosore kuri astigmatism.
2. Lens ya Bifocal ni iki?
Lens ya Bifocal ifite ibice bibiri bitandukanye byo gukosora iyerekwa. Uturere tugabanijwe numurongo utandukanye wicaye utambitse hejuru yinzira. Igice cyo hejuru cya lens gikoreshwa intera, mugihe igice cyo hepfo gikoreshwa hafi yicyerekezo. Igice cya lens cyeguriwe iyerekwa hafi gishobora gushirwaho muburyo butandukanye: D igice, igice cyizengurutse (kigaragara / kitagaragara), igice kigoramye na E-murongo.
Indangantego ya Bifocal ikoreshwa mugihe umuntu ari umuntu udasanzwe udashobora kumenyera lens igenda itera imbere cyangwa mubana bato amaso yabo yambuka iyo basomye. Impamvu zidakoreshwa cyane ni uko hari ikibazo gikunze guterwa na lens ya bifocal bita "image jump", aho amashusho asa nkaho asimbuka mugihe amaso yawe agenda hagati yibice byombi.
3. Lens Iterambere Niki?
Igishushanyo mbonera cyiterambere ni gishya kandi cyateye imbere kuruta bifocals. Izi lens zitanga intambwe igenda itera imbaraga kuva hejuru yinteguza kugeza hasi, itanga inzibacyuho idafite icyerekezo gikenewe mubyerekezo bitandukanye. Indorerwamo z'amaso zitera imbere nazo zitwa nta murongo-wo gutandukanya kuko nta murongo ugaragara uri hagati y'ibice, bigatuma barushaho gushimisha.
Byongeye kandi, indorerwamo z'amaso zitera imbere nazo zikora inzibacyuho yoroheje hagati yintera, hagati, hamwe nibice byanditse. Igice cyo hagati yinzira nicyiza kubikorwa byo hagati nko gukora mudasobwa. Indorerwamo zamaso zitera imbere zifite amahitamo maremare cyangwa magufi ya koridor. Koridor nigice cyingenzi cyinzira iguha ubushobozi bwo kubona intera ndende.
Mu ijambo, iyerekwa rimwe (SV), bifocal, hamwe niterambere ryiterambere buri kimwe gitanga ibisubizo bitandukanye byo gukosora. Intumbero imwe yo kureba ikosora intera imwe (hafi cyangwa kure), mugihe ibice bibiri kandi bigenda bitera imbere byerekanwe hafi na kure mumurongo umwe. Bifocals ifite umurongo ugaragara utandukanya ibice byegeranye nintera, mugihe lens igenda itera imbere itanga icyerekezo, cyarangije impamyabumenyi hagati yintera idafite umurongo ugaragara. Niba ukeneye andi makuru, nyamuneka twandikire.